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1. HAY. BUTTONHOLE SEWING MACHINE.

APPLICAHON FILED M/\Y19,l915. RENEWED JULY 25.1918.

Patented May 13, 191.9.

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it iteirrrieri ii. ooit t fitlttieltith v ttppli eetiozi illicit the titttt tleiiel lto. tittttttl, ltterietretl Jltilgr fill, wit. Itcriel We. Fttttft'tit.

it all whom it may concern:

Be it known. that it ,Enenrm al EASY? citizen of the 'IUnitcdL ifitetee, reeitliri Beverly, in the county or liloeeit onrl titete of lt'les sachusette, here inv'eiitetl eertein new and useful improvements in Buttonhole Sewing Machines; and l tlohcrehy ilmlere the following; to be a toll clear. enrl description of the lllvelfllllfill such its, will enable others skilled, in the art to Which it e 'iperteinsto nae-he anti the some, i

The invention relates to huttonhole eeW- ing mechince and more perticnl triy to on under thread tension mechehieni for such machines.

Iii (ioing certain classes of Worlt it is tlesirohle to use a comparatively heovy tension on the under thread, and. in some ceeee the desired tension may he heery enough to interfere with the proper or easy teed of the Work between the cutting; and sewing" of seccessirehuttonhoiee;

It is the object of the present invention to provide novel and ini irovetl mechanism. for automatically releasing the teneion on the under thread at the encl of the sewing enrl for resippl ring the tension at the beginning]; of the sewing. To this eocl the invention consists in the-features ot'conetriietion and COPlblHRiLlOHS of parts hereinafter described anal rciferretl to in the claims.

The invention will be readily iliMlfilSl-Ofitl from on inspection or the (RffKJlHlTrimVll'iyf drmri entl the following ileteileml (lo ecription oi. the mechanism ilhietreteil therein.

inv the drawing-e, leigore l is e vertical sectional View showing so mrzch oi it hot: tonhole sewing machine as is necessary to illustrate the application ot the present invention thereto and Fig. S3 is e detail plon View showing the under threerl mechanism and it part of the clamp carrier in the drawings the invention is shown as embodied in e hlittonhole sewing machine having};- suhstehtielly the construction eiicl mode of operation of the machine SllOWlTl and described in Potent 1,063,880, cleteil June 3, 191.3. in this machine the etitch forming mechanism comprises an upper nee tile 5; eecentricelly mounted in e vertically reciprocating needle her at on uncler needle 6, and e iooper 8i Ilhe upper ne e her en ti the under needle end lcoper are moiintccl respectively in. a raster}; carrier 10* and e rothiecittcetieii oi. ltcttere "irioontecl on supporting plates: 16 which irruttorihoie to brine; the irorlr into -.reroilritioii tor e 'Worol to tiring the ll ttteiniteot lhleygr lltliltlt tor y turret 12 Which are rotated. during; the sewing; about the end hoot eye of the huttofohole, lhc Worlr s held by clamps 'lhe liiioliy o. the reg; oter with the hiittonhole critter 30, or with the stitch toriiiin hiechoiiiem, end to :teetl the Work tiurin the sewing by, a. coin groove iorinecl in the cam gear 9th hichinehes one och. cycle iii the machine The chimp ce is moved leterelly, and the stitch torn n; mechanism; ie rotetecl in turn hieiihtecl on it clamp cerrier lit chimp cel'rler is moved lo-n thiririg", he eetvi three eiiiteh-i'e conneo tlorie 1on1 e r 94L which. makes one revo l-oition during}: tli newline: of o huttoehole.

The te ieiori roechenlem tor the under threw. comprieee e stationery oheh flit ee etireii upon the turret 12, end it coiiperetinr;

rlisit moiintetl upon it stridi- 3O creel preeeetl e-goinet the rlielr Eli? hr e spring 32, the tetrsion. oi? which they he oiijnstecl hy the net 34. 'lhe their 918 is of such it diameter that projects heyoiirl the ot the dish: 'Elti encl into the path oil. it lingi er 36 which it cured to the clamp terrier 18. The router thread it led tronri the thread supply? through e 'liitohle guides up through the hollow link 3 which terms e port of the tnechoniem'ifor' ecteetiiig under needle "eiiel loo 'ior thhiece hetrveeii the tension clielre tlll'Cl through at thread guide til oh the tnrreh. throat "h e thread, goiole t2 on the UtlClGl' iioeiile Firm one! thence to the under "ilei ten the machine is rest the Worlr chimp iii. petition to regieter with the cutter end the teneion mlcoeingfinger fiti is in eogregementrvith the dish 28, e1. M hclrle it error irroin the dish 26 egremet the tension of the spring; 89;, go that the tension on the under thread is released. lli heh the machine is stertecl, the chimp ie cloeetl encl the cutter operated to cut the hiittonhole elit, encl then the chimp corrier mores tcrhuttonhole slit into regi ie her with the stitch forming lllflcllllllfill'h The :toirirerrl movement ot the clamp with draws the finger 36 from engagement r l i the (.l'iflh'j hit, so thot the tension is eppliecl to the imi'ler threezi hr the time thot the hot ton hole elit ie hrciight iiito i'eiriejterwith the sewing; nieclmiiiein, omit the eewihgg mcch inane is eterterh At the completion the I" titl t5 ii i or? sewing the sewing mechanism is stopped,

and the rotation of the turret is arrested with the turret in the position indicated in Fig. 2. The turret remains in this position until the beginning of the sewing of the next buttonhole. After t e sewing has been completed, and the sewing mechanism and turret stopped, the clamp carriage is retracted to bring the Work clamps into position to register with the cutter, and the machine is then stopped with the parts in the position-indicated in Fig. 1. During this movement of the clamp carrier from sewing to cutting position the tension releasing finger 36' again engages the tension disk 28 and releases the tension upon the under thread, so that the Work may be moved easily and freely into position for the cutting and sewing of the next buttonhole.

Having explained the nature and object of the invention, and specifically described one-form of mechanism in which it may be embodied, What is claimed is:

1. A buttonhol-e sewing machine, having, in combination, stitch forming mechanism comprising upper and under thread mechanism, a work clamp carrier, a rotary turret carrying the under thread mechanism, mech anism for relatively actuating the stitch forming mechanism and clamp carrier to sew about a buttonhole, an under thread tension device mounted on the turret comprising a movable thread engaging member, and a finger on the clamp carrier engaged with and disengaged from said movable member by the relative movement of the clamp and stitch forming mechanism to apply the tension at the beginning of the sewing and to relieve the tension at the completion of the sewing. 1 2. A buttonhole sewing machine, having, in combination, stitch forming mechanism comprising upper and under thread mechanisms, a rotary turret carrying the under thread mechanism, a longitudinal and laterally movable work clamp carrier, an under thread tension device on the turret comprising a movable disk, and a finger on the carrier engaged with and disengaged from the disk by the reciprocation of the carrier.

EUGENE J. RAY. 

